added a test for THash, unified the names of all intermediate files to test*.dat
added a demo program for THash, updated demo programs to name working data files demo*.dat, improved demo Makefile so that individual targets are not needed, minor fixes to test-THash.cpp
changed EFailR() to FailR() when out of memory
minor edit in mkdatasets.cpp
Addressed the warnings about implicit conversions from int64 to int in dt.h, tm.h, os.h.
Updated GetTriads and GetClustCf to return the number of triads as int64 (not int) since otherwise overflows were common for large graphs
Merge branch 'master' into jure
Changed int to int64 in triads.h
Changed int to int64 in triads.h
Changed int to int64 in triads.h
Modifying vector class to 64bits
Added test-generated graph files to .gitignore..
Added 64-bit vector and 64-bit vector pool. Also added commments to both classes.
New 10x faster hash functions for TPair, TTriple, TQuad and TTuple
Added 64-bit random number generator
Merge pull request #4 from snap-stanford/jure

Jure, roks
Added baseline files for graph visualization.
Created helper files for file IO tests.
Moved IO functions to helper file.
Fixed typos. Added documentation.